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Topic under SIL ( Safety Integrity Level )Source: www.keesofferman.nl File size:195 KBFile type:pdfLast download on:
Wed Dec 13, 2017 02:37:04 AMShort Desciption:
This paper details the process in which the HAZOP / SIL study is conducted. The first part
indicates the steps involved and later an example illustrates the steps.

Summary:
Traditionally, a Hazard and Operability (HAZOP) study and Safety Integrity Level (SIL)
Assessment or SIL determination (usually using the Risk Graph or Layer Of Protection
Analysis (LOPA) methodology) are two separate facilitated sessions, which produce two
unique databases. SIL Validation is yet a third requirement of the International Electro
technical Commission (IEC) 61511 standards that demands the use of another set of tools and
produces a third database. Trying to manage the recommendations of these interconnected
studies is extremely difficult. In the Integrated Approach, only one facilitated session is
required for HAZOP and SIL Assessment. Only one database is created, and it is used to
perform SIL Validation. In addition to being a secure and auditable database, this single
database is also part of a complete “handover package” that operators need to ensure they
maintain the SIL integrity assigned to each SIL loop. Some demonstrated benefits of the
Integrated Approach are a minimum 30% time and costs savings; a single auditable database;
elimination of mathematical errors during SIL Validation; creation of a complete electronic
handover data package and the capability of operators to easily model proposed changes to
their maintenance and testing plans (SIL Optimization) using the same database.
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